How can I write log(e) in MATLAB?

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Melika Qahqaie
Melika Qahqaie 2018-4-15
评论： Walter Roberson 2021-4-16
I am trying to calculate x=log(e) but I can not. Any help?
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Walter Roberson
Walter Roberson 2021-4-16
Ran in:
f = @(x) 4.^x - 256;
log4_256 = fzero(f, 1.2345)
log4_256 = 4
4^log4_256
ans = 256

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David Fletcher
David Fletcher 2018-4-15
I assume you mean log10? In Matlab log is base e, so log(e)=1
x=log10(exp(1))
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sultana saffi
sultana saffi 2021-4-16
can you help with this pleas x=log4(256)
John D'Errico
John D'Errico 2021-4-16
@sultana saffi Please stop spamming this question with answers and comments to compute a log to do your homework.
Do you know the basic rule for logs to other bases?
The formula is given here:
https://www.purplemath.com/modules/logrules5.htm

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